diff --git a/docs/api/routes/stock/accept.md b/docs/api/routes/stock/accept.md
index e35afe8..f182e84 100644
--- a/docs/api/routes/stock/accept.md
+++ b/docs/api/routes/stock/accept.md
@@ -45,9 +45,11 @@ Delivery item(s) accepted successfully
 
 | Status | Description |
 |--------|-------------|
-| 400 | Validation error or no company selected |
-| 404 | Manifest article or warehouse not found |
-| 409 | Delivery line already accepted on ledger |
+| 400 | Validation error or no company selected — `{"error":"…"}` |
+| 401 | Unauthorized — `{"error":"…"}` |
+| 403 | Not authorized — `{"error":"…"}` |
+| 404 | Manifest article or warehouse not found — `{"error":"…"}` |
+| 409 | Delivery line already accepted on ledger or stock tracking disabled — `{"error":"…"}` |
 
 ---
 
diff --git a/docs/api/routes/stock/adjust.md b/docs/api/routes/stock/adjust.md
index 1ff15f6..ec96773 100644
--- a/docs/api/routes/stock/adjust.md
+++ b/docs/api/routes/stock/adjust.md
@@ -92,6 +92,7 @@ Stock adjusted successfully
 | 401 | Unauthorized — `{"error":"…"}` |
 | 403 | Not authorized — `{"error":"…"}` |
 | 404 | Article or warehouse not found — `{"error":"…"}` |
+| 409 | Stock tracking is disabled — `{"error":"…"}` |
 
 ---
 
diff --git a/docs/api/routes/stock/ship.md b/docs/api/routes/stock/ship.md
index 2b05758..6aa111b 100644
--- a/docs/api/routes/stock/ship.md
+++ b/docs/api/routes/stock/ship.md
@@ -45,9 +45,11 @@ Shipment item(s) shipped successfully
 
 | Status | Description |
 |--------|-------------|
-| 400 | Validation error or no company selected |
-| 404 | Manifest article or warehouse not found |
-| 409 | Shipment line already shipped on ledger |
+| 400 | Validation error or no company selected — `{"error":"…"}` |
+| 401 | Unauthorized — `{"error":"…"}` |
+| 403 | Not authorized — `{"error":"…"}` |
+| 404 | Manifest article or warehouse not found — `{"error":"…"}` |
+| 409 | Shipment line already shipped on ledger or stock tracking disabled — `{"error":"…"}` |
 
 ---
 
diff --git a/src/api/routes/stock.js b/src/api/routes/stock.js
index c447be9..10efd46 100644
--- a/src/api/routes/stock.js
+++ b/src/api/routes/stock.js
@@ -14,16 +14,29 @@ function requireSelectedCompany(req) {
 function stockErrorStatus(error) {
     if (error.message === 'No company selected') return 400;
     if (error.message === 'Not authorized') return 403;
-    if (error.message === 'Company not found') return 404;
-    if (error.message === 'Article not found') return 404;
-    if (error.message === 'Warehouse not found') return 404;
-    if (error.message?.includes('SKU required')) return 400;
-    if (error.message?.includes('Warehouse required')) return 400;
-    if (error.message?.includes('Amount must be')) return 400;
-    if (error.message?.includes('Invalid amount')) return 400;
-    if (error.message === 'No items to adjust') return 400;
-    if (error.message?.includes('cannot have stock') || error.message?.includes('A parent article cannot have') || error.message?.includes('parent article') || error.message?.includes('Stückliste')) return 400;
-    if (error.message?.includes('Stock tracking is disabled')) return 409;
+    if (error.message?.includes('not found')) return 404;
+    if (
+        error.message?.includes('already accepted') ||
+        error.message?.includes('already shipped') ||
+        error.message?.includes('already booked') ||
+        error.message?.includes('Stock tracking is disabled')
+    ) {
+        return 409;
+    }
+    if (
+        error.message?.includes('required') ||
+        error.message?.includes('Invalid') ||
+        error.message?.includes('Amount must be') ||
+        error.message?.includes('Warehouse must be') ||
+        error.message?.includes('No items') ||
+        error.message?.includes('does not belong to') ||
+        error.message?.includes('cannot have stock') ||
+        error.message?.includes('parent article') ||
+        error.message?.includes('Stückliste') ||
+        error.message?.includes('has no SKU')
+    ) {
+        return 400;
+    }
     return 500;
 }
 
@@ -114,6 +127,12 @@ export function register(app, basePath = '') {
      *           application/json:
      *             schema:
      *               $ref: '#/components/schemas/Error'
+     *       409:
+     *         description: Stock tracking is disabled
+     *         content:
+     *           application/json:
+     *             schema:
+     *               $ref: '#/components/schemas/Error'
      */
     // #region POST /stock/adjust
 
@@ -178,10 +197,34 @@ export function register(app, basePath = '') {
      *         description: Delivery item(s) accepted successfully
      *       400:
      *         description: Validation error or no company selected
+     *         content:
+     *           application/json:
+     *             schema:
+     *               $ref: '#/components/schemas/Error'
+     *       401:
+     *         description: Unauthorized
+     *         content:
+     *           application/json:
+     *             schema:
+     *               $ref: '#/components/schemas/Error'
+     *       403:
+     *         description: Not authorized
+     *         content:
+     *           application/json:
+     *             schema:
+     *               $ref: '#/components/schemas/Error'
      *       404:
      *         description: Manifest article or warehouse not found
+     *         content:
+     *           application/json:
+     *             schema:
+     *               $ref: '#/components/schemas/Error'
      *       409:
-     *         description: Delivery line already accepted on ledger
+     *         description: Delivery line already accepted on ledger or stock tracking disabled
+     *         content:
+     *           application/json:
+     *             schema:
+     *               $ref: '#/components/schemas/Error'
      */
     // #region POST /stock/accept
 
@@ -249,10 +292,34 @@ export function register(app, basePath = '') {
      *         description: Shipment item(s) shipped successfully
      *       400:
      *         description: Validation error or no company selected
+     *         content:
+     *           application/json:
+     *             schema:
+     *               $ref: '#/components/schemas/Error'
+     *       401:
+     *         description: Unauthorized
+     *         content:
+     *           application/json:
+     *             schema:
+     *               $ref: '#/components/schemas/Error'
+     *       403:
+     *         description: Not authorized
+     *         content:
+     *           application/json:
+     *             schema:
+     *               $ref: '#/components/schemas/Error'
      *       404:
      *         description: Manifest article or warehouse not found
+     *         content:
+     *           application/json:
+     *             schema:
+     *               $ref: '#/components/schemas/Error'
      *       409:
-     *         description: Shipment line already shipped on ledger
+     *         description: Shipment line already shipped on ledger or stock tracking disabled
+     *         content:
+     *           application/json:
+     *             schema:
+     *               $ref: '#/components/schemas/Error'
      */
     // #region POST /stock/ship